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Past exam of the mathematics course of the University of Cambridge
/
2025
/
iii
/
Paper 345
/
2
/
b
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Mathematics course of the University of Cambridge
Past exam of the mathematics course of the University of Cambridge
2025
iii
Paper 345
2
2026-09-24
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Solution
b
Solution
0
0
0
b
Define
the
reduced gravity
g
′
=
g
ρ
2
ρ
1
−
ρ
2
,
(1)
and use the Boussinesq limit
ρ
1
≃
ρ
2
except in
buoyancy
. The
balances
become
g
t
′
+
u
g
x
′
=
−
g
′
h
w
e
,
(2)
h
t
+
u
h
x
+
h
u
x
=
w
e
−
w
d
,
(3)
u
t
+
u
u
x
+
g
′
h
x
+
2
h
g
x
′
=
−
u
h
w
e
.
(4)
Thus, for
q
=
(
g
′
,
h
,
u
)
T
,
q
t
+
u
0
h
/2
0
u
g
′
0
h
u
q
x
=
−
g
′
w
e
/
h
w
e
−
w
d
−
u
w
e
/
h
,
(5)
which is the required
entraining shallow-water layer
system.
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2
Paper 345
iii
2025
Past exam of the mathematics course of the University of Cambridge
Mathematics course of the University of Cambridge
Course of the University of Cambridge
University of Cambridge
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